Open WebUI: Authenticated users can bypass model access control via exposed query parameter [AI-ASSISTED]

SummaryAn internal-only bypassfilter parameter is exposed on the /openai/chat/completions and /ollama/api/chat HTTP endpoints via FastAPI query string binding, allowing any authenticated user to append ?bypassfilter=true and bypass model access control checks to invoke admin-restricted models...

PT-2026-41183

Name of the Vulnerable Software and Affected Versions Open WebUI versions prior to 0.8.11 Description An internal-only bypass filter parameter is exposed on the '/openai/chat/completions' and '/ollama/api/chat' HTTP endpoints due to FastAPI query string binding. This allows any authenticated user...